1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2012 5 * Author(s): Hartmut Penner (hp@de.ibm.com), 6 * Martin Schwidefsky (schwidefsky@de.ibm.com) 7 * 8 * Derived from "arch/i386/kernel/setup.c" 9 * Copyright (C) 1995, Linus Torvalds 10 */ 11 12 /* 13 * This file handles the architecture-dependent parts of initialization 14 */ 15 16 #define KMSG_COMPONENT "setup" 17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 18 19 #include <linux/errno.h> 20 #include <linux/export.h> 21 #include <linux/sched.h> 22 #include <linux/sched/task.h> 23 #include <linux/cpu.h> 24 #include <linux/kernel.h> 25 #include <linux/memblock.h> 26 #include <linux/mm.h> 27 #include <linux/stddef.h> 28 #include <linux/unistd.h> 29 #include <linux/ptrace.h> 30 #include <linux/random.h> 31 #include <linux/user.h> 32 #include <linux/tty.h> 33 #include <linux/ioport.h> 34 #include <linux/delay.h> 35 #include <linux/init.h> 36 #include <linux/initrd.h> 37 #include <linux/root_dev.h> 38 #include <linux/console.h> 39 #include <linux/kernel_stat.h> 40 #include <linux/dma-map-ops.h> 41 #include <linux/device.h> 42 #include <linux/notifier.h> 43 #include <linux/pfn.h> 44 #include <linux/ctype.h> 45 #include <linux/reboot.h> 46 #include <linux/topology.h> 47 #include <linux/kexec.h> 48 #include <linux/crash_dump.h> 49 #include <linux/memory.h> 50 #include <linux/compat.h> 51 #include <linux/start_kernel.h> 52 #include <linux/hugetlb.h> 53 54 #include <asm/boot_data.h> 55 #include <asm/ipl.h> 56 #include <asm/facility.h> 57 #include <asm/smp.h> 58 #include <asm/mmu_context.h> 59 #include <asm/cpcmd.h> 60 #include <asm/lowcore.h> 61 #include <asm/nmi.h> 62 #include <asm/irq.h> 63 #include <asm/page.h> 64 #include <asm/ptrace.h> 65 #include <asm/sections.h> 66 #include <asm/ebcdic.h> 67 #include <asm/diag.h> 68 #include <asm/os_info.h> 69 #include <asm/sclp.h> 70 #include <asm/stacktrace.h> 71 #include <asm/sysinfo.h> 72 #include <asm/numa.h> 73 #include <asm/alternative.h> 74 #include <asm/nospec-branch.h> 75 #include <asm/mem_detect.h> 76 #include <asm/uv.h> 77 #include <asm/asm-offsets.h> 78 #include "entry.h" 79 80 /* 81 * Machine setup.. 82 */ 83 unsigned int console_mode = 0; 84 EXPORT_SYMBOL(console_mode); 85 86 unsigned int console_devno = -1; 87 EXPORT_SYMBOL(console_devno); 88 89 unsigned int console_irq = -1; 90 EXPORT_SYMBOL(console_irq); 91 92 unsigned long elf_hwcap __read_mostly = 0; 93 char elf_platform[ELF_PLATFORM_SIZE]; 94 95 unsigned long int_hwcap = 0; 96 97 int __bootdata(noexec_disabled); 98 unsigned long __bootdata(ident_map_size); 99 unsigned long __bootdata(vmalloc_size); 100 struct mem_detect_info __bootdata(mem_detect); 101 102 struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table); 103 struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table); 104 unsigned long __bootdata_preserved(__stext_dma); 105 unsigned long __bootdata_preserved(__etext_dma); 106 unsigned long __bootdata_preserved(__sdma); 107 unsigned long __bootdata_preserved(__edma); 108 unsigned long __bootdata_preserved(__kaslr_offset); 109 unsigned int __bootdata_preserved(zlib_dfltcc_support); 110 EXPORT_SYMBOL(zlib_dfltcc_support); 111 112 unsigned long VMALLOC_START; 113 EXPORT_SYMBOL(VMALLOC_START); 114 115 unsigned long VMALLOC_END; 116 EXPORT_SYMBOL(VMALLOC_END); 117 118 struct page *vmemmap; 119 EXPORT_SYMBOL(vmemmap); 120 unsigned long vmemmap_size; 121 122 unsigned long MODULES_VADDR; 123 unsigned long MODULES_END; 124 125 /* An array with a pointer to the lowcore of every CPU. */ 126 struct lowcore *lowcore_ptr[NR_CPUS]; 127 EXPORT_SYMBOL(lowcore_ptr); 128 129 /* 130 * The Write Back bit position in the physaddr is given by the SLPC PCI. 131 * Leaving the mask zero always uses write through which is safe 132 */ 133 unsigned long mio_wb_bit_mask __ro_after_init; 134 135 /* 136 * This is set up by the setup-routine at boot-time 137 * for S390 need to find out, what we have to setup 138 * using address 0x10400 ... 139 */ 140 141 #include <asm/setup.h> 142 143 /* 144 * condev= and conmode= setup parameter. 145 */ 146 147 static int __init condev_setup(char *str) 148 { 149 int vdev; 150 151 vdev = simple_strtoul(str, &str, 0); 152 if (vdev >= 0 && vdev < 65536) { 153 console_devno = vdev; 154 console_irq = -1; 155 } 156 return 1; 157 } 158 159 __setup("condev=", condev_setup); 160 161 static void __init set_preferred_console(void) 162 { 163 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP) 164 add_preferred_console("ttyS", 0, NULL); 165 else if (CONSOLE_IS_3270) 166 add_preferred_console("tty3270", 0, NULL); 167 else if (CONSOLE_IS_VT220) 168 add_preferred_console("ttyS", 1, NULL); 169 else if (CONSOLE_IS_HVC) 170 add_preferred_console("hvc", 0, NULL); 171 } 172 173 static int __init conmode_setup(char *str) 174 { 175 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 176 if (!strcmp(str, "hwc") || !strcmp(str, "sclp")) 177 SET_CONSOLE_SCLP; 178 #endif 179 #if defined(CONFIG_TN3215_CONSOLE) 180 if (!strcmp(str, "3215")) 181 SET_CONSOLE_3215; 182 #endif 183 #if defined(CONFIG_TN3270_CONSOLE) 184 if (!strcmp(str, "3270")) 185 SET_CONSOLE_3270; 186 #endif 187 set_preferred_console(); 188 return 1; 189 } 190 191 __setup("conmode=", conmode_setup); 192 193 static void __init conmode_default(void) 194 { 195 char query_buffer[1024]; 196 char *ptr; 197 198 if (MACHINE_IS_VM) { 199 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); 200 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 201 ptr = strstr(query_buffer, "SUBCHANNEL ="); 202 console_irq = simple_strtoul(ptr + 13, NULL, 16); 203 cpcmd("QUERY TERM", query_buffer, 1024, NULL); 204 ptr = strstr(query_buffer, "CONMODE"); 205 /* 206 * Set the conmode to 3215 so that the device recognition 207 * will set the cu_type of the console to 3215. If the 208 * conmode is 3270 and we don't set it back then both 209 * 3215 and the 3270 driver will try to access the console 210 * device (3215 as console and 3270 as normal tty). 211 */ 212 cpcmd("TERM CONMODE 3215", NULL, 0, NULL); 213 if (ptr == NULL) { 214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 215 SET_CONSOLE_SCLP; 216 #endif 217 return; 218 } 219 if (str_has_prefix(ptr + 8, "3270")) { 220 #if defined(CONFIG_TN3270_CONSOLE) 221 SET_CONSOLE_3270; 222 #elif defined(CONFIG_TN3215_CONSOLE) 223 SET_CONSOLE_3215; 224 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 225 SET_CONSOLE_SCLP; 226 #endif 227 } else if (str_has_prefix(ptr + 8, "3215")) { 228 #if defined(CONFIG_TN3215_CONSOLE) 229 SET_CONSOLE_3215; 230 #elif defined(CONFIG_TN3270_CONSOLE) 231 SET_CONSOLE_3270; 232 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 233 SET_CONSOLE_SCLP; 234 #endif 235 } 236 } else if (MACHINE_IS_KVM) { 237 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) 238 SET_CONSOLE_VT220; 239 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) 240 SET_CONSOLE_SCLP; 241 else 242 SET_CONSOLE_HVC; 243 } else { 244 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) 245 SET_CONSOLE_SCLP; 246 #endif 247 } 248 } 249 250 #ifdef CONFIG_CRASH_DUMP 251 static void __init setup_zfcpdump(void) 252 { 253 if (!is_ipl_type_dump()) 254 return; 255 if (OLDMEM_BASE) 256 return; 257 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev"); 258 console_loglevel = 2; 259 } 260 #else 261 static inline void setup_zfcpdump(void) {} 262 #endif /* CONFIG_CRASH_DUMP */ 263 264 /* 265 * Reboot, halt and power_off stubs. They just call _machine_restart, 266 * _machine_halt or _machine_power_off. 267 */ 268 269 void machine_restart(char *command) 270 { 271 if ((!in_interrupt() && !in_atomic()) || oops_in_progress) 272 /* 273 * Only unblank the console if we are called in enabled 274 * context or a bust_spinlocks cleared the way for us. 275 */ 276 console_unblank(); 277 _machine_restart(command); 278 } 279 280 void machine_halt(void) 281 { 282 if (!in_interrupt() || oops_in_progress) 283 /* 284 * Only unblank the console if we are called in enabled 285 * context or a bust_spinlocks cleared the way for us. 286 */ 287 console_unblank(); 288 _machine_halt(); 289 } 290 291 void machine_power_off(void) 292 { 293 if (!in_interrupt() || oops_in_progress) 294 /* 295 * Only unblank the console if we are called in enabled 296 * context or a bust_spinlocks cleared the way for us. 297 */ 298 console_unblank(); 299 _machine_power_off(); 300 } 301 302 /* 303 * Dummy power off function. 304 */ 305 void (*pm_power_off)(void) = machine_power_off; 306 EXPORT_SYMBOL_GPL(pm_power_off); 307 308 void *restart_stack; 309 310 unsigned long stack_alloc(void) 311 { 312 #ifdef CONFIG_VMAP_STACK 313 return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE, 314 THREADINFO_GFP, NUMA_NO_NODE, 315 __builtin_return_address(0)); 316 #else 317 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 318 #endif 319 } 320 321 void stack_free(unsigned long stack) 322 { 323 #ifdef CONFIG_VMAP_STACK 324 vfree((void *) stack); 325 #else 326 free_pages(stack, THREAD_SIZE_ORDER); 327 #endif 328 } 329 330 int __init arch_early_irq_init(void) 331 { 332 unsigned long stack; 333 334 stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER); 335 if (!stack) 336 panic("Couldn't allocate async stack"); 337 S390_lowcore.async_stack = stack + STACK_INIT_OFFSET; 338 return 0; 339 } 340 341 static int __init stack_realloc(void) 342 { 343 unsigned long old, new; 344 345 old = S390_lowcore.async_stack - STACK_INIT_OFFSET; 346 new = stack_alloc(); 347 if (!new) 348 panic("Couldn't allocate async stack"); 349 WRITE_ONCE(S390_lowcore.async_stack, new + STACK_INIT_OFFSET); 350 free_pages(old, THREAD_SIZE_ORDER); 351 352 old = S390_lowcore.mcck_stack - STACK_INIT_OFFSET; 353 new = stack_alloc(); 354 if (!new) 355 panic("Couldn't allocate machine check stack"); 356 WRITE_ONCE(S390_lowcore.mcck_stack, new + STACK_INIT_OFFSET); 357 memblock_free(old, THREAD_SIZE); 358 return 0; 359 } 360 early_initcall(stack_realloc); 361 362 void __init arch_call_rest_init(void) 363 { 364 unsigned long stack; 365 366 stack = stack_alloc(); 367 if (!stack) 368 panic("Couldn't allocate kernel stack"); 369 current->stack = (void *) stack; 370 #ifdef CONFIG_VMAP_STACK 371 current->stack_vm_area = (void *) stack; 372 #endif 373 set_task_stack_end_magic(current); 374 stack += STACK_INIT_OFFSET; 375 S390_lowcore.kernel_stack = stack; 376 CALL_ON_STACK_NORETURN(rest_init, stack); 377 } 378 379 static void __init setup_lowcore_dat_off(void) 380 { 381 unsigned long int_psw_mask = PSW_KERNEL_BITS; 382 unsigned long mcck_stack; 383 struct lowcore *lc; 384 385 if (IS_ENABLED(CONFIG_KASAN)) 386 int_psw_mask |= PSW_MASK_DAT; 387 388 /* 389 * Setup lowcore for boot cpu 390 */ 391 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); 392 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); 393 if (!lc) 394 panic("%s: Failed to allocate %zu bytes align=%zx\n", 395 __func__, sizeof(*lc), sizeof(*lc)); 396 397 lc->restart_psw.mask = PSW_KERNEL_BITS; 398 lc->restart_psw.addr = (unsigned long) restart_int_handler; 399 lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 400 lc->external_new_psw.addr = (unsigned long) ext_int_handler; 401 lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 402 lc->svc_new_psw.addr = (unsigned long) system_call; 403 lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 404 lc->program_new_psw.addr = (unsigned long) pgm_check_handler; 405 lc->mcck_new_psw.mask = PSW_KERNEL_BITS; 406 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; 407 lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; 408 lc->io_new_psw.addr = (unsigned long) io_int_handler; 409 lc->clock_comparator = clock_comparator_max; 410 lc->nodat_stack = ((unsigned long) &init_thread_union) 411 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); 412 lc->current_task = (unsigned long)&init_task; 413 lc->lpp = LPP_MAGIC; 414 lc->machine_flags = S390_lowcore.machine_flags; 415 lc->preempt_count = S390_lowcore.preempt_count; 416 lc->stfl_fac_list = S390_lowcore.stfl_fac_list; 417 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, 418 sizeof(lc->stfle_fac_list)); 419 memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list, 420 sizeof(lc->alt_stfle_fac_list)); 421 nmi_alloc_boot_cpu(lc); 422 lc->sys_enter_timer = S390_lowcore.sys_enter_timer; 423 lc->exit_timer = S390_lowcore.exit_timer; 424 lc->user_timer = S390_lowcore.user_timer; 425 lc->system_timer = S390_lowcore.system_timer; 426 lc->steal_timer = S390_lowcore.steal_timer; 427 lc->last_update_timer = S390_lowcore.last_update_timer; 428 lc->last_update_clock = S390_lowcore.last_update_clock; 429 430 /* 431 * Allocate the global restart stack which is the same for 432 * all CPUs in cast *one* of them does a PSW restart. 433 */ 434 restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE); 435 if (!restart_stack) 436 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 437 __func__, THREAD_SIZE, THREAD_SIZE); 438 restart_stack += STACK_INIT_OFFSET; 439 440 /* 441 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant 442 * restart data to the absolute zero lowcore. This is necessary if 443 * PSW restart is done on an offline CPU that has lowcore zero. 444 */ 445 lc->restart_stack = (unsigned long) restart_stack; 446 lc->restart_fn = (unsigned long) do_restart; 447 lc->restart_data = 0; 448 lc->restart_source = -1UL; 449 450 mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); 451 if (!mcck_stack) 452 panic("%s: Failed to allocate %lu bytes align=0x%lx\n", 453 __func__, THREAD_SIZE, THREAD_SIZE); 454 lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; 455 456 /* Setup absolute zero lowcore */ 457 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack); 458 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn); 459 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data); 460 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source); 461 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw); 462 463 lc->spinlock_lockval = arch_spin_lockval(0); 464 lc->spinlock_index = 0; 465 arch_spin_lock_setup(0); 466 lc->br_r1_trampoline = 0x07f1; /* br %r1 */ 467 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); 468 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); 469 470 set_prefix((u32)(unsigned long) lc); 471 lowcore_ptr[0] = lc; 472 } 473 474 static void __init setup_lowcore_dat_on(void) 475 { 476 __ctl_clear_bit(0, 28); 477 S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; 478 S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; 479 S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; 480 S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; 481 __ctl_set_bit(0, 28); 482 } 483 484 static struct resource code_resource = { 485 .name = "Kernel code", 486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 487 }; 488 489 static struct resource data_resource = { 490 .name = "Kernel data", 491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 492 }; 493 494 static struct resource bss_resource = { 495 .name = "Kernel bss", 496 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, 497 }; 498 499 static struct resource __initdata *standard_resources[] = { 500 &code_resource, 501 &data_resource, 502 &bss_resource, 503 }; 504 505 static void __init setup_resources(void) 506 { 507 struct resource *res, *std_res, *sub_res; 508 phys_addr_t start, end; 509 int j; 510 u64 i; 511 512 code_resource.start = (unsigned long) _text; 513 code_resource.end = (unsigned long) _etext - 1; 514 data_resource.start = (unsigned long) _etext; 515 data_resource.end = (unsigned long) _edata - 1; 516 bss_resource.start = (unsigned long) __bss_start; 517 bss_resource.end = (unsigned long) __bss_stop - 1; 518 519 for_each_mem_range(i, &start, &end) { 520 res = memblock_alloc(sizeof(*res), 8); 521 if (!res) 522 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 523 __func__, sizeof(*res), 8); 524 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; 525 526 res->name = "System RAM"; 527 res->start = start; 528 /* 529 * In memblock, end points to the first byte after the 530 * range while in resourses, end points to the last byte in 531 * the range. 532 */ 533 res->end = end - 1; 534 request_resource(&iomem_resource, res); 535 536 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { 537 std_res = standard_resources[j]; 538 if (std_res->start < res->start || 539 std_res->start > res->end) 540 continue; 541 if (std_res->end > res->end) { 542 sub_res = memblock_alloc(sizeof(*sub_res), 8); 543 if (!sub_res) 544 panic("%s: Failed to allocate %zu bytes align=0x%x\n", 545 __func__, sizeof(*sub_res), 8); 546 *sub_res = *std_res; 547 sub_res->end = res->end; 548 std_res->start = res->end + 1; 549 request_resource(res, sub_res); 550 } else { 551 request_resource(res, std_res); 552 } 553 } 554 } 555 #ifdef CONFIG_CRASH_DUMP 556 /* 557 * Re-add removed crash kernel memory as reserved memory. This makes 558 * sure it will be mapped with the identity mapping and struct pages 559 * will be created, so it can be resized later on. 560 * However add it later since the crash kernel resource should not be 561 * part of the System RAM resource. 562 */ 563 if (crashk_res.end) { 564 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); 565 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 566 insert_resource(&iomem_resource, &crashk_res); 567 } 568 #endif 569 } 570 571 static void __init setup_ident_map_size(void) 572 { 573 unsigned long vmax, tmp; 574 575 /* Choose kernel address space layout: 3 or 4 levels. */ 576 tmp = ident_map_size / PAGE_SIZE; 577 tmp = tmp * (sizeof(struct page) + PAGE_SIZE); 578 if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE) 579 vmax = _REGION2_SIZE; /* 3-level kernel page table */ 580 else 581 vmax = _REGION1_SIZE; /* 4-level kernel page table */ 582 /* module area is at the end of the kernel address space. */ 583 MODULES_END = vmax; 584 if (is_prot_virt_host()) 585 adjust_to_uv_max(&MODULES_END); 586 #ifdef CONFIG_KASAN 587 vmax = _REGION1_SIZE; 588 MODULES_END = kasan_vmax; 589 #endif 590 MODULES_VADDR = MODULES_END - MODULES_LEN; 591 VMALLOC_END = MODULES_VADDR; 592 VMALLOC_START = VMALLOC_END - vmalloc_size; 593 594 /* Split remaining virtual space between 1:1 mapping & vmemmap array */ 595 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page)); 596 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */ 597 tmp = SECTION_ALIGN_UP(tmp); 598 tmp = VMALLOC_START - tmp * sizeof(struct page); 599 tmp &= ~((vmax >> 11) - 1); /* align to page table level */ 600 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS); 601 vmemmap = (struct page *) tmp; 602 603 /* Take care that ident_map_size <= vmemmap */ 604 ident_map_size = min(ident_map_size, (unsigned long)vmemmap); 605 #ifdef CONFIG_KASAN 606 ident_map_size = min(ident_map_size, KASAN_SHADOW_START); 607 #endif 608 vmemmap_size = SECTION_ALIGN_UP(ident_map_size / PAGE_SIZE) * sizeof(struct page); 609 #ifdef CONFIG_KASAN 610 /* move vmemmap above kasan shadow only if stands in a way */ 611 if (KASAN_SHADOW_END > (unsigned long)vmemmap && 612 (unsigned long)vmemmap + vmemmap_size > KASAN_SHADOW_START) 613 vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); 614 #endif 615 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); 616 memblock_remove(ident_map_size, ULONG_MAX); 617 618 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); 619 } 620 621 #ifdef CONFIG_CRASH_DUMP 622 623 /* 624 * When kdump is enabled, we have to ensure that no memory from the area 625 * [0 - crashkernel memory size] is set offline - it will be exchanged with 626 * the crashkernel memory region when kdump is triggered. The crashkernel 627 * memory region can never get offlined (pages are unmovable). 628 */ 629 static int kdump_mem_notifier(struct notifier_block *nb, 630 unsigned long action, void *data) 631 { 632 struct memory_notify *arg = data; 633 634 if (action != MEM_GOING_OFFLINE) 635 return NOTIFY_OK; 636 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) 637 return NOTIFY_BAD; 638 return NOTIFY_OK; 639 } 640 641 static struct notifier_block kdump_mem_nb = { 642 .notifier_call = kdump_mem_notifier, 643 }; 644 645 #endif 646 647 /* 648 * Make sure that the area above identity mapping is protected 649 */ 650 static void __init reserve_above_ident_map(void) 651 { 652 memblock_reserve(ident_map_size, ULONG_MAX); 653 } 654 655 /* 656 * Make sure that oldmem, where the dump is stored, is protected 657 */ 658 static void __init reserve_oldmem(void) 659 { 660 #ifdef CONFIG_CRASH_DUMP 661 if (OLDMEM_BASE) 662 /* Forget all memory above the running kdump system */ 663 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 664 #endif 665 } 666 667 /* 668 * Make sure that oldmem, where the dump is stored, is protected 669 */ 670 static void __init remove_oldmem(void) 671 { 672 #ifdef CONFIG_CRASH_DUMP 673 if (OLDMEM_BASE) 674 /* Forget all memory above the running kdump system */ 675 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX); 676 #endif 677 } 678 679 /* 680 * Reserve memory for kdump kernel to be loaded with kexec 681 */ 682 static void __init reserve_crashkernel(void) 683 { 684 #ifdef CONFIG_CRASH_DUMP 685 unsigned long long crash_base, crash_size; 686 phys_addr_t low, high; 687 int rc; 688 689 rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size, 690 &crash_base); 691 692 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); 693 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); 694 if (rc || crash_size == 0) 695 return; 696 697 if (memblock.memory.regions[0].size < crash_size) { 698 pr_info("crashkernel reservation failed: %s\n", 699 "first memory chunk must be at least crashkernel size"); 700 return; 701 } 702 703 low = crash_base ?: OLDMEM_BASE; 704 high = low + crash_size; 705 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) { 706 /* The crashkernel fits into OLDMEM, reuse OLDMEM */ 707 crash_base = low; 708 } else { 709 /* Find suitable area in free memory */ 710 low = max_t(unsigned long, crash_size, sclp.hsa_size); 711 high = crash_base ? crash_base + crash_size : ULONG_MAX; 712 713 if (crash_base && crash_base < low) { 714 pr_info("crashkernel reservation failed: %s\n", 715 "crash_base too low"); 716 return; 717 } 718 low = crash_base ?: low; 719 crash_base = memblock_find_in_range(low, high, crash_size, 720 KEXEC_CRASH_MEM_ALIGN); 721 } 722 723 if (!crash_base) { 724 pr_info("crashkernel reservation failed: %s\n", 725 "no suitable area found"); 726 return; 727 } 728 729 if (register_memory_notifier(&kdump_mem_nb)) 730 return; 731 732 if (!OLDMEM_BASE && MACHINE_IS_VM) 733 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size)); 734 crashk_res.start = crash_base; 735 crashk_res.end = crash_base + crash_size - 1; 736 memblock_remove(crash_base, crash_size); 737 pr_info("Reserving %lluMB of memory at %lluMB " 738 "for crashkernel (System RAM: %luMB)\n", 739 crash_size >> 20, crash_base >> 20, 740 (unsigned long)memblock.memory.total_size >> 20); 741 os_info_crashkernel_add(crash_base, crash_size); 742 #endif 743 } 744 745 /* 746 * Reserve the initrd from being used by memblock 747 */ 748 static void __init reserve_initrd(void) 749 { 750 #ifdef CONFIG_BLK_DEV_INITRD 751 if (!INITRD_START || !INITRD_SIZE) 752 return; 753 initrd_start = INITRD_START; 754 initrd_end = initrd_start + INITRD_SIZE; 755 memblock_reserve(INITRD_START, INITRD_SIZE); 756 #endif 757 } 758 759 /* 760 * Reserve the memory area used to pass the certificate lists 761 */ 762 static void __init reserve_certificate_list(void) 763 { 764 if (ipl_cert_list_addr) 765 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size); 766 } 767 768 static void __init reserve_mem_detect_info(void) 769 { 770 unsigned long start, size; 771 772 get_mem_detect_reserved(&start, &size); 773 if (size) 774 memblock_reserve(start, size); 775 } 776 777 static void __init free_mem_detect_info(void) 778 { 779 unsigned long start, size; 780 781 get_mem_detect_reserved(&start, &size); 782 if (size) 783 memblock_free(start, size); 784 } 785 786 static const char * __init get_mem_info_source(void) 787 { 788 switch (mem_detect.info_source) { 789 case MEM_DETECT_SCLP_STOR_INFO: 790 return "sclp storage info"; 791 case MEM_DETECT_DIAG260: 792 return "diag260"; 793 case MEM_DETECT_SCLP_READ_INFO: 794 return "sclp read info"; 795 case MEM_DETECT_BIN_SEARCH: 796 return "binary search"; 797 } 798 return "none"; 799 } 800 801 static void __init memblock_add_mem_detect_info(void) 802 { 803 unsigned long start, end; 804 int i; 805 806 pr_debug("physmem info source: %s (%hhd)\n", 807 get_mem_info_source(), mem_detect.info_source); 808 /* keep memblock lists close to the kernel */ 809 memblock_set_bottom_up(true); 810 for_each_mem_detect_block(i, &start, &end) { 811 memblock_add(start, end - start); 812 memblock_physmem_add(start, end - start); 813 } 814 memblock_set_bottom_up(false); 815 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); 816 memblock_dump_all(); 817 } 818 819 /* 820 * Check for initrd being in usable memory 821 */ 822 static void __init check_initrd(void) 823 { 824 #ifdef CONFIG_BLK_DEV_INITRD 825 if (INITRD_START && INITRD_SIZE && 826 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) { 827 pr_err("The initial RAM disk does not fit into the memory\n"); 828 memblock_free(INITRD_START, INITRD_SIZE); 829 initrd_start = initrd_end = 0; 830 } 831 #endif 832 } 833 834 /* 835 * Reserve memory used for lowcore/command line/kernel image. 836 */ 837 static void __init reserve_kernel(void) 838 { 839 unsigned long start_pfn = PFN_UP(__pa(_end)); 840 841 memblock_reserve(0, HEAD_END); 842 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn) 843 - (unsigned long)_stext); 844 memblock_reserve(__sdma, __edma - __sdma); 845 } 846 847 static void __init setup_memory(void) 848 { 849 phys_addr_t start, end; 850 u64 i; 851 852 /* 853 * Init storage key for present memory 854 */ 855 for_each_mem_range(i, &start, &end) 856 storage_key_init_range(start, end); 857 858 psw_set_key(PAGE_DEFAULT_KEY); 859 860 /* Only cosmetics */ 861 memblock_enforce_memory_limit(memblock_end_of_DRAM()); 862 } 863 864 /* 865 * Setup hardware capabilities. 866 */ 867 static int __init setup_hwcaps(void) 868 { 869 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 }; 870 struct cpuid cpu_id; 871 int i; 872 873 /* 874 * The store facility list bits numbers as found in the principles 875 * of operation are numbered with bit 1UL<<31 as number 0 to 876 * bit 1UL<<0 as number 31. 877 * Bit 0: instructions named N3, "backported" to esa-mode 878 * Bit 2: z/Architecture mode is active 879 * Bit 7: the store-facility-list-extended facility is installed 880 * Bit 17: the message-security assist is installed 881 * Bit 19: the long-displacement facility is installed 882 * Bit 21: the extended-immediate facility is installed 883 * Bit 22: extended-translation facility 3 is installed 884 * Bit 30: extended-translation facility 3 enhancement facility 885 * These get translated to: 886 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1, 887 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3, 888 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and 889 * HWCAP_S390_ETF3EH bit 8 (22 && 30). 890 */ 891 for (i = 0; i < 6; i++) 892 if (test_facility(stfl_bits[i])) 893 elf_hwcap |= 1UL << i; 894 895 if (test_facility(22) && test_facility(30)) 896 elf_hwcap |= HWCAP_S390_ETF3EH; 897 898 /* 899 * Check for additional facilities with store-facility-list-extended. 900 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0 901 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information 902 * as stored by stfl, bits 32-xxx contain additional facilities. 903 * How many facility words are stored depends on the number of 904 * doublewords passed to the instruction. The additional facilities 905 * are: 906 * Bit 42: decimal floating point facility is installed 907 * Bit 44: perform floating point operation facility is installed 908 * translated to: 909 * HWCAP_S390_DFP bit 6 (42 && 44). 910 */ 911 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44)) 912 elf_hwcap |= HWCAP_S390_DFP; 913 914 /* 915 * Huge page support HWCAP_S390_HPAGE is bit 7. 916 */ 917 if (MACHINE_HAS_EDAT1) 918 elf_hwcap |= HWCAP_S390_HPAGE; 919 920 /* 921 * 64-bit register support for 31-bit processes 922 * HWCAP_S390_HIGH_GPRS is bit 9. 923 */ 924 elf_hwcap |= HWCAP_S390_HIGH_GPRS; 925 926 /* 927 * Transactional execution support HWCAP_S390_TE is bit 10. 928 */ 929 if (MACHINE_HAS_TE) 930 elf_hwcap |= HWCAP_S390_TE; 931 932 /* 933 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension 934 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX 935 * instead of facility bit 129. 936 */ 937 if (MACHINE_HAS_VX) { 938 elf_hwcap |= HWCAP_S390_VXRS; 939 if (test_facility(134)) 940 elf_hwcap |= HWCAP_S390_VXRS_EXT; 941 if (test_facility(135)) 942 elf_hwcap |= HWCAP_S390_VXRS_BCD; 943 if (test_facility(148)) 944 elf_hwcap |= HWCAP_S390_VXRS_EXT2; 945 if (test_facility(152)) 946 elf_hwcap |= HWCAP_S390_VXRS_PDE; 947 } 948 if (test_facility(150)) 949 elf_hwcap |= HWCAP_S390_SORT; 950 if (test_facility(151)) 951 elf_hwcap |= HWCAP_S390_DFLT; 952 953 /* 954 * Guarded storage support HWCAP_S390_GS is bit 12. 955 */ 956 if (MACHINE_HAS_GS) 957 elf_hwcap |= HWCAP_S390_GS; 958 959 get_cpu_id(&cpu_id); 960 add_device_randomness(&cpu_id, sizeof(cpu_id)); 961 switch (cpu_id.machine) { 962 case 0x2064: 963 case 0x2066: 964 default: /* Use "z900" as default for 64 bit kernels. */ 965 strcpy(elf_platform, "z900"); 966 break; 967 case 0x2084: 968 case 0x2086: 969 strcpy(elf_platform, "z990"); 970 break; 971 case 0x2094: 972 case 0x2096: 973 strcpy(elf_platform, "z9-109"); 974 break; 975 case 0x2097: 976 case 0x2098: 977 strcpy(elf_platform, "z10"); 978 break; 979 case 0x2817: 980 case 0x2818: 981 strcpy(elf_platform, "z196"); 982 break; 983 case 0x2827: 984 case 0x2828: 985 strcpy(elf_platform, "zEC12"); 986 break; 987 case 0x2964: 988 case 0x2965: 989 strcpy(elf_platform, "z13"); 990 break; 991 case 0x3906: 992 case 0x3907: 993 strcpy(elf_platform, "z14"); 994 break; 995 case 0x8561: 996 case 0x8562: 997 strcpy(elf_platform, "z15"); 998 break; 999 } 1000 1001 /* 1002 * Virtualization support HWCAP_INT_SIE is bit 0. 1003 */ 1004 if (sclp.has_sief2) 1005 int_hwcap |= HWCAP_INT_SIE; 1006 1007 return 0; 1008 } 1009 arch_initcall(setup_hwcaps); 1010 1011 /* 1012 * Add system information as device randomness 1013 */ 1014 static void __init setup_randomness(void) 1015 { 1016 struct sysinfo_3_2_2 *vmms; 1017 1018 vmms = (struct sysinfo_3_2_2 *) memblock_phys_alloc(PAGE_SIZE, 1019 PAGE_SIZE); 1020 if (!vmms) 1021 panic("Failed to allocate memory for sysinfo structure\n"); 1022 1023 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count) 1024 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count); 1025 memblock_free((unsigned long) vmms, PAGE_SIZE); 1026 } 1027 1028 /* 1029 * Find the correct size for the task_struct. This depends on 1030 * the size of the struct fpu at the end of the thread_struct 1031 * which is embedded in the task_struct. 1032 */ 1033 static void __init setup_task_size(void) 1034 { 1035 int task_size = sizeof(struct task_struct); 1036 1037 if (!MACHINE_HAS_VX) { 1038 task_size -= sizeof(__vector128) * __NUM_VXRS; 1039 task_size += sizeof(freg_t) * __NUM_FPRS; 1040 } 1041 arch_task_struct_size = task_size; 1042 } 1043 1044 /* 1045 * Issue diagnose 318 to set the control program name and 1046 * version codes. 1047 */ 1048 static void __init setup_control_program_code(void) 1049 { 1050 union diag318_info diag318_info = { 1051 .cpnc = CPNC_LINUX, 1052 .cpvc = 0, 1053 }; 1054 1055 if (!sclp.has_diag318) 1056 return; 1057 1058 diag_stat_inc(DIAG_STAT_X318); 1059 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); 1060 } 1061 1062 /* 1063 * Print the component list from the IPL report 1064 */ 1065 static void __init log_component_list(void) 1066 { 1067 struct ipl_rb_component_entry *ptr, *end; 1068 char *str; 1069 1070 if (!early_ipl_comp_list_addr) 1071 return; 1072 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) 1073 pr_info("Linux is running with Secure-IPL enabled\n"); 1074 else 1075 pr_info("Linux is running with Secure-IPL disabled\n"); 1076 ptr = (void *) early_ipl_comp_list_addr; 1077 end = (void *) ptr + early_ipl_comp_list_size; 1078 pr_info("The IPL report contains the following components:\n"); 1079 while (ptr < end) { 1080 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { 1081 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) 1082 str = "signed, verified"; 1083 else 1084 str = "signed, verification failed"; 1085 } else { 1086 str = "not signed"; 1087 } 1088 pr_info("%016llx - %016llx (%s)\n", 1089 ptr->addr, ptr->addr + ptr->len, str); 1090 ptr++; 1091 } 1092 } 1093 1094 /* 1095 * Setup function called from init/main.c just after the banner 1096 * was printed. 1097 */ 1098 1099 void __init setup_arch(char **cmdline_p) 1100 { 1101 /* 1102 * print what head.S has found out about the machine 1103 */ 1104 if (MACHINE_IS_VM) 1105 pr_info("Linux is running as a z/VM " 1106 "guest operating system in 64-bit mode\n"); 1107 else if (MACHINE_IS_KVM) 1108 pr_info("Linux is running under KVM in 64-bit mode\n"); 1109 else if (MACHINE_IS_LPAR) 1110 pr_info("Linux is running natively in 64-bit mode\n"); 1111 else 1112 pr_info("Linux is running as a guest in 64-bit mode\n"); 1113 1114 log_component_list(); 1115 1116 /* Have one command line that is parsed and saved in /proc/cmdline */ 1117 /* boot_command_line has been already set up in early.c */ 1118 *cmdline_p = boot_command_line; 1119 1120 ROOT_DEV = Root_RAM0; 1121 1122 init_mm.start_code = (unsigned long) _text; 1123 init_mm.end_code = (unsigned long) _etext; 1124 init_mm.end_data = (unsigned long) _edata; 1125 init_mm.brk = (unsigned long) _end; 1126 1127 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO)) 1128 nospec_auto_detect(); 1129 1130 jump_label_init(); 1131 parse_early_param(); 1132 #ifdef CONFIG_CRASH_DUMP 1133 /* Deactivate elfcorehdr= kernel parameter */ 1134 elfcorehdr_addr = ELFCORE_ADDR_MAX; 1135 #endif 1136 1137 os_info_init(); 1138 setup_ipl(); 1139 setup_task_size(); 1140 setup_control_program_code(); 1141 1142 /* Do some memory reservations *before* memory is added to memblock */ 1143 reserve_above_ident_map(); 1144 reserve_oldmem(); 1145 reserve_kernel(); 1146 reserve_initrd(); 1147 reserve_certificate_list(); 1148 reserve_mem_detect_info(); 1149 memblock_allow_resize(); 1150 1151 /* Get information about *all* installed memory */ 1152 memblock_add_mem_detect_info(); 1153 1154 free_mem_detect_info(); 1155 remove_oldmem(); 1156 1157 setup_uv(); 1158 setup_ident_map_size(); 1159 setup_memory(); 1160 dma_contiguous_reserve(ident_map_size); 1161 vmcp_cma_reserve(); 1162 if (MACHINE_HAS_EDAT2) 1163 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 1164 1165 check_initrd(); 1166 reserve_crashkernel(); 1167 #ifdef CONFIG_CRASH_DUMP 1168 /* 1169 * Be aware that smp_save_dump_cpus() triggers a system reset. 1170 * Therefore CPU and device initialization should be done afterwards. 1171 */ 1172 smp_save_dump_cpus(); 1173 #endif 1174 1175 setup_resources(); 1176 setup_lowcore_dat_off(); 1177 smp_fill_possible_mask(); 1178 cpu_detect_mhz_feature(); 1179 cpu_init(); 1180 numa_setup(); 1181 smp_detect_cpus(); 1182 topology_init_early(); 1183 1184 /* 1185 * Create kernel page tables and switch to virtual addressing. 1186 */ 1187 paging_init(); 1188 1189 /* 1190 * After paging_init created the kernel page table, the new PSWs 1191 * in lowcore can now run with DAT enabled. 1192 */ 1193 setup_lowcore_dat_on(); 1194 1195 /* Setup default console */ 1196 conmode_default(); 1197 set_preferred_console(); 1198 1199 apply_alternative_instructions(); 1200 if (IS_ENABLED(CONFIG_EXPOLINE)) 1201 nospec_init_branches(); 1202 1203 /* Setup zfcp/nvme dump support */ 1204 setup_zfcpdump(); 1205 1206 /* Add system specific data to the random pool */ 1207 setup_randomness(); 1208 } 1209